EP0493201B1 - Zerlegbares Skelett eines Kernbrennstabbündels - Google Patents

Zerlegbares Skelett eines Kernbrennstabbündels Download PDF

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Publication number
EP0493201B1
EP0493201B1 EP91403443A EP91403443A EP0493201B1 EP 0493201 B1 EP0493201 B1 EP 0493201B1 EP 91403443 A EP91403443 A EP 91403443A EP 91403443 A EP91403443 A EP 91403443A EP 0493201 B1 EP0493201 B1 EP 0493201B1
Authority
EP
European Patent Office
Prior art keywords
peg
end piece
skeleton according
guide tube
fingers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91403443A
Other languages
English (en)
French (fr)
Other versions
EP0493201A1 (de
Inventor
Michel Verdier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Orano Demantelement SAS
Original Assignee
Framatome SA
Compagnie Generale des Matieres Nucleaires SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Framatome SA, Compagnie Generale des Matieres Nucleaires SA filed Critical Framatome SA
Priority to DE9117030U priority Critical patent/DE9117030U1/de
Publication of EP0493201A1 publication Critical patent/EP0493201A1/de
Application granted granted Critical
Publication of EP0493201B1 publication Critical patent/EP0493201B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/334—Assembling, maintenance or repair of the bundles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to nuclear fuel assemblies and, more particularly, fuel assemblies comprising a skeleton constituting the structure of the assembly and maintaining a bundle of fuel rods at the nodes of a regular network.
  • fuel assemblies comprising a skeleton constituting the structure of the assembly and maintaining a bundle of fuel rods at the nodes of a regular network.
  • Such assemblies are used in particular in reactors cooled and moderated by light water.
  • the skeleton then comprises two end pieces connected by guide tubes which carry grids distributed along the guide tubes and retaining the fuel rods at the nodes of the network (EP-A-0 076 748 and EP-A-0 360 664).
  • the guide tubes are designed to receive rods belonging to absorbent clusters for reactivity control and / or to clusters for varying the energy spectrum of neutrons. To attenuate the shock caused by the fall of the bunches in the event of an emergency shutdown of the reactor, the guide tubes are often used as a hydraulic shock absorber by providing them with a lower plug pierced with a narrow passage.
  • the tips are made of a material having high mechanical properties, such as stainless steel or one of the alloys known under the name of Inconel, while the guide tubes are made of an alloy based on zirconium. Consequently, it is difficult to fix the tubes directly to the ends by welding. In addition, it is desirable that the fixing of the guide tubes to at least one of the end pieces is easily removable and reassemblable, in order to allow the replacement of defective rods.
  • the invention aims to provide an assembly skeleton of the kind defined above, the lower end piece of which can be quickly dismantled and reassembled and the connecting means of which can be produced relatively simply and at an acceptable cost.
  • the invention proposes in particular a skeleton according to claim 1.
  • the end part of the spindle, beyond the upwardly directed shoulder, advantageously has a flared shape so that a vertical thrust exerted on the guide tube causes the elastic fingers to come together and allow the spindle to be inserted. until the fingers click into place.
  • the passage in the end piece is constituted by a simple cylindrical machining, which can open upwards by a chamfer to facilitate the insertion of the spindle.
  • the spindle is advantageously made of a material having proven mechanical properties, such as Inconel 718.
  • the spindle can then be fixed to the guide tube, generally made from a base alloy. of zirconium, by circular crimping of the guide tube in a groove of the spindle.
  • the removable means put in place after snap-fasting, prevent the fingers from coming together.
  • These means may in particular be constituted by a locking ring housed in a groove of the spindle and the ends of which are inserted into the slots separating the fingers.
  • connection between the guide tubes and the upper nozzle can be achieved by any of the arrangements well known at present.
  • the skeleton fraction shown in FIG. 1 can belong to a skeleton having the same general constitution as that of fuel assemblies for known pressurized water reactors, that is to say having an upper nozzle 10 and a lower nozzle 12 pierced with d 'refrigerant passage openings and connected by guide tubes 14 which carry grids not shown.
  • a skeleton constitution will not be described, since reference can be made to numerous prior documents, for example to document EP-A-0 187 578 to find an assembly description which can be modified to implement the invention.
  • Each of the guide tubes 14 of the kind shown in FIG. 1 is connected to the lower end piece by means according to a particular embodiment of the invention, allowing easy disassembly and yet of simple constitution.
  • the part of these means belonging to the end piece 12 is limited to a bore 18 advantageously comprising an inlet chamfer 20 intended to facilitate the insertion of the end piece on the means carried by the guide tubes 14.
  • the part of the means carried by the guide tube is constituted by a simple pin 16, the upper part of which is fixed in the tube 14 and the lower part of which is divided by slots 22 into several fingers 24 (four in number, separated by two cross slots in the case of Figures 1 and 2). These fingers are thin enough to be elastic.
  • the lower part ends in a flared zone constituting a cone facilitating the entry of the spindle into the bore 18.
  • the fingers 24 have a shoulder 26 located at the base of the flared area, placed at a distance from a shoulder 28 separating the upper and lower parts which is equal to the thickness of the end piece 12.
  • the projection of the shoulder 26 and the width of the slits 22 are proportioned so that in the relaxed state the fingers are trapped in the lower end, but that the shoulders 26 can pass into the bore 18 in the event of bending of the fingers inwards.
  • the guide tubes 14 are generally made of a zirconium-based alloy, such as one of those known under the name of "zircaloy” whose mechanical properties, especially after irradiation, are insufficient to constitute the pin 16.
  • zirconium-based alloy such as one of those known under the name of "zircaloy” whose mechanical properties, especially after irradiation, are insufficient to constitute the pin 16.
  • the latter thus generally that the tips, will be made of stainless steel or one of the alloys known as Inconel, which is difficult to weld with zirconium-based alloys.
  • each guide tube 14 is supported on a shoulder of the upper part of the associated pin and is fixed by crimping in a groove 29 of the upper part, according to a well known and mastered technique.
  • a small diameter hole 30 is generally drilled in the axis of the upper part of the spindle 16 and opens out between the fingers 24.
  • a protruding part 45 can be provided to create a dead volume 47 capable of receiving small debris and to avoid plugging the hole 30.
  • the guide tubes can be fixed to the upper end piece 10 by known means of construction.
  • screwed sockets provided with a thin deformable skirt in notches of the end piece in order to block them in rotation (FR-A-2 465 916).
  • each guide tube 14 and the upper end piece 10 is made by crimping.
  • the passage for receiving a guide tube in the end piece successively has, from top to bottom, a cylindrical part in which is formed a crimping groove 32, a slightly frustoconical part separated from the cylindrical part by a shoulder 34 and having a crimping groove 36 and finally a cylindrical lower part.
  • the fixing operation is as follows: the guide tube is introduced into the endpiece which is positioned axially. It is crimped by deformation in the groove 36. The risk of separation is avoided by forcibly introducing a sleeve 38 having an upper thin skirt which is deformed in the groove 32.
  • the positioning of the lower end piece 12 on the guide tubes 14, advantageously maintained in their nominal position by cross combs, is carried out by simple displacement of the end piece 12 in the direction indicated by the arrow f0.
  • the pressure of the chamfer 20 on the flared end of the pin 16 causes the fingers to flex.
  • the fingers 24 have just passed the tip and move away.
  • the shoulders 26 snap onto the end piece.
  • FIGS. 4 and 5 differs from that which has just been described by the presence of means easily installed or removed, preventing mutual bringing together of the fingers when they are in place.
  • the means shown by way of example are constituted by a rod 42 having an angular development of 270 ° and terminated by rectilinear portions which are inserted in the slots separating the fingers 24.
  • the rod is retained in a groove of the spindle and forbidden fingers to approach.
  • the assembly is carried out as in the case of FIGS. 1 to 3.
  • the rod is put in place in the groove, located below the end piece 12, once the fingers are snapped.
  • the dismantling of the lower end piece can be done very simply.
  • all the pins are simultaneously driven back using a single tool 44 provided with pins 46 having a conical bearing surface.
  • the displacement of the tool in the direction of the arrow f1 successively brings the fingers 24 together, then raises the guide tubes. It would also be possible to rest the pins on the tool 44, then pull down the end piece 12.
  • This tool can also be used for mounting and avoid excessive friction of the fingers in the end piece.
  • the fingers 24 have a radial thickness which decreases towards the end, so that to obtain the constraints in the fingers 24 and their rigidity. This result can be obtained in a simple way by cutting the fingers from a blank having two or more successive diameters.
  • the upper part of the spindle has a second circumferential groove 48.
  • This groove can be used to perform a second crimping of the guide tube 14. But it also allows, by providing it on a zone of reduced diameter of the upper part, to crimp a tubular cartridge 50, of length significantly less than that of the guide tube.
  • This cartridge which is generally a few tenths of a millimeter thick, has the function of throttling the leakage path upwards in the event of a pencil falling into the guide tube and therefore acts as a hydraulic damper.
  • the cartridge 50 mounted with gentle friction in the guide tube, can bear on a shoulder of the upper part and be crimped in the groove 48, before fitting and crimping the guide tube.
  • connection between the guide tubes 14 and the lower end piece 12 is carried out by simple means, comprising a single piece in addition to the guide tubes and the end piece.
  • the manufacturing and inspection cost is reduced.
  • the assembly time in the factory is reduced, as well as the intervention times for possible disassembly and reassembly.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Claims (9)

  1. Skelett für Kernbrennelementkassetten mit durch Führungsrohre (14) verbundenen Kopfstücken (10, 12),
    dadurch gekennzeichnet, daß die Verbindungsmittel umfassen:
    - einen Zapfen (16), in dem eine Drosselöffnung (30) den Durchgang von Kühlmittel gebildet ist, der einen im Führungsrohr befestigten oberen Bereich und einen vorspringenden unteren Bereich umfaßt, der eine nach unten gerichtete Schulter (28) zum Abstützen am unteren Kopfstück aufweist, einen im unteren Kopfstück gebildeten Durchgang durchquert und in mehrere elastische Finger (24) unterteilt ist, die jeweils eine nach oben gerichtete Schulter (26) zum Einhaken am unteren Kopfstück (12) besitzen, und
    - abnehmbare Mittel (42) zum Verhindern des gegenseitigen Annäherns der Finger.
  2. Skelett nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Endbereich des Zapfens jenseits der nach oben gerichteten Schulter eine sich verjüngende Form hat.
  3. Skelett nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß
    der Zapfen (16) aus nichtrostendem Stahl oder Inconel besteht und am Führungsrohr (14) aus einer Legierung auf Zirkoniumgrundlage durch eine kreisförmige Bördelung des Führungsrohrs (14) in einer ersten Nut (29) des Zapfens befestigt ist.
  4. Skelett nach Anspruch 1, 2 oder 3,
    dadurch gekennzeichnet, daß
    die abnehmbaren Mittel aus einem Verschlußring (42) bestehen, der in einer dritten Nut des Zapfens untergebracht ist, und dessen Enden in die die Finger (24) trennenden Schlitze (24) eingreifen.
  5. Skelett nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, daß
    der obere Bereich des Zapfens (16) einen nach oben gerichteten vorspringenden Bereich (45) umfaßt, der einen ringförmigen Totraum (47) zur Aufnahme von Rückständen bildet.
  6. Skelett nach Anspruch 3,
    dadurch gekennzeichnet, daß
    der Zapfen eine zweite Nut (48) aufweist zum Anbördeln einer rohrförmigen Hülse (50) für die hydraulische Dämpfung, die mit leichter Reibung im Führungsrohr (14) montiert ist.
  7. Skelett nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die elastischen Finger (24) eine von oben nach unten abnehmende Dicke haben.
  8. Skelett nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Verbindung zwischen den Führungsrohren (14) und dem oberen Kopfstück (10) durch verschraubte Hülsen (38) hergestellt wird, die durch Verformung einer dünnen Schürze der Hülsen gehalten werden.
  9. Skelett nach einem der Ansprüche 1 bis 7,
    dadurch gekennzeichnet, daß
    der obere Bereich eines jeden Führungsrohrs in eine Ausnehmung des oberen Kopfstücks (10) eingebördelt und durch eine unter Kraftaufwand eingeführte Hülse (38) blockiert ist.
EP91403443A 1990-12-21 1991-12-18 Zerlegbares Skelett eines Kernbrennstabbündels Expired - Lifetime EP0493201B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9117030U DE9117030U1 (de) 1990-12-21 1991-12-18 Skelett für Kernbrennelementkassetten

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9016121A FR2670944B1 (fr) 1990-12-21 1990-12-21 Squelette d'assemblage combustible nucleaire.
FR9016121 1990-12-21

Publications (2)

Publication Number Publication Date
EP0493201A1 EP0493201A1 (de) 1992-07-01
EP0493201B1 true EP0493201B1 (de) 1995-07-05

Family

ID=9403550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403443A Expired - Lifetime EP0493201B1 (de) 1990-12-21 1991-12-18 Zerlegbares Skelett eines Kernbrennstabbündels

Country Status (5)

Country Link
US (1) US5232655A (de)
EP (1) EP0493201B1 (de)
DE (1) DE69111039T2 (de)
ES (1) ES2074680T3 (de)
FR (1) FR2670944B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361283A (en) * 1994-03-15 1994-11-01 B&W Fuel Company Guide tube retainer
US5367548A (en) * 1994-03-15 1994-11-22 B&W Fuel Company Guide tube retainer
US5663993A (en) * 1995-10-12 1997-09-02 General Electric Company Water rod flow metering within the water rod lower end plug
EP0895248A1 (de) * 1997-07-29 1999-02-03 Empresa Nacional Del Uranio, S.A. Befestigungssystem für das untere Endstück, das Steuerstabdämpfungsstück und versteifte Führungsrohre in Kernreaktorbrennstabbündeln
EP1248271B1 (de) * 2001-04-05 2008-04-23 Mitsubishi Heavy Industries, Ltd. Brennstabbündel
EP2356423B1 (de) 2008-11-12 2024-08-07 Ventana Medical Systems, Inc. Verfahren und vorrichtungen zum erwärmen von präparate tragenden objektträgern
CN109935364A (zh) * 2017-12-19 2019-06-25 中国原子能科学研究院 一种导向管连接管、上管座及燃料组件骨架

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126767A (en) * 1972-07-07 1978-11-21 Combustion Engineering, Inc. Bottom actuated reactor control system
US3855060A (en) * 1972-07-10 1974-12-17 Combustion Eng Bottom actuated reactor control rod devices
DE2520345A1 (de) * 1975-05-07 1976-11-18 Interatom Befestigungsanordnung fuer kernreaktorbrennstaebe o.dgl.
FR2514188B1 (fr) * 1981-10-05 1985-08-16 Framatome Sa Assemblage combustible pour un reacteur nucleaire
FR2529704B1 (fr) * 1982-07-01 1987-09-04 Commissariat Energie Atomique Dispositif de fixation demontable d'un tube guide dans la piece d'extremite d'un assemblage combustible de reacteur nucleaire
DE3228381A1 (de) * 1982-07-29 1984-03-15 Kraftwerk Union AG, 4330 Mülheim Kernreaktorbrennelement
FR2575583B1 (fr) * 1984-12-27 1987-03-06 Fragema Framatome & Cogema Dispositif de deplacement d'une grappe de crayons de commande de reacteur nucleaire
US4684499A (en) * 1985-12-10 1987-08-04 Westinghouse Electric Corp. Burnable absorber rod releasable latching structure
FR2593958B1 (fr) * 1986-01-24 1991-01-11 Framatome Sa Bague de guidage amovible et verrouillable dans une ouverture traversant une plaque et son application a un tube de guidage de reacteur nucleaire
US4716004A (en) * 1986-02-06 1987-12-29 Westinghouse Electric Corp. Thimble guide extender
ES2055803T3 (es) * 1988-09-19 1994-09-01 Framatome Sa Dispositivo de fijacion desmontable de un tubo-guia en una pieza de conexion extrema de un conjunto combustible de un reactor nuclear.

Also Published As

Publication number Publication date
DE69111039T2 (de) 1995-11-02
US5232655A (en) 1993-08-03
FR2670944B1 (fr) 1994-04-08
ES2074680T3 (es) 1995-09-16
FR2670944A1 (fr) 1992-06-26
DE69111039D1 (de) 1995-08-10
EP0493201A1 (de) 1992-07-01

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